Sounds like a good starting point for a module if some of the code can be broken out.
I've done a pretty thorough review of the available open source options and am saddened to report that there doesn't seem to be anything out there that:
- provides for funds to be paid directly to the merchant
- avoids use of hot wallet (via XPub or even pre-generated keys)
- avoids reliance on third parties, eg blockchain.info
I found gourl which has plugins for many popular shopping carts but they receive/forward and take a cut. I haven't looked at their code yet... it may be possible to fork and replace the naughty bits.
I don't have much time just at the moment either, but I'm contemplating writing something that would meet the above requirements in the coming months.
The way I see it, there could be a single core logic library and then multiple customizations for plugging into various popular shopping carts.
fbueller, I'm already familiar with your bitwasp php lib. If you could find some time to break out the relevant bits of your code, then perhaps that could help me get a running head start. Even if just as an incomplete example/reference. If not, no worries... should be straightforward enough.
I wrote one a while ago in PHP, but haven't had the time to keep it up to date and secure.
It used a full node for blockchain information, accepted xpub's from admins/merchants/buyers, and generated multisig addresses. Private keys weren't stored or generated by the system, but eventually for usability, I allowed users to generate private keys using a passphrase in javascript. Convenience/Security trade off, but that's how it goes.
It lets users paste in signed raw transactions, or use the javascript thing to generate it in the browser if the user went that route. I'd love to revisit it, but it's a full featured site, not a module.